This advisory also applies to the corresponding versions of
Kubuntu, Edubuntu, and Xubuntu.

The problem can be corrected by upgrading your system to the
following package versions:

Ubuntu 10.04 LTS:
thunderbird 3.0.6+build2+nobinonly-0ubuntu0.10.04.1

After a standard system update you need to restart Thunderbird to make
all the necessary changes.

Details follow:

Several flaws were discovered in the browser engine of Thunderbird. If a
user were tricked into viewing malicious content, a remote attacker could
use this to crash Thunderbird or possibly run arbitrary code as the user
invoking the program. (CVE-2010-1211, CVE-2010-1212)

An integer overflow was discovered in how Thunderbird processed CSS values.
An attacker could exploit this to crash Thunderbird or possibly run
arbitrary code as the user invoking the program. (CVE-2010-2752)

An integer overflow was discovered in how Thunderbird interpreted the XUL
element. If a user were tricked into viewing malicious content, a remote
attacker could use this to crash Thunderbird or possibly run arbitrary code
as the user invoking the program. (CVE-2010-2753)

Aki Helin discovered that libpng did not properly handle certain malformed
PNG images. If a user were tricked into opening a crafted PNG file, an
attacker could cause a denial of service or possibly execute arbitrary code
with the privileges of the user invoking the program. (CVE-2010-1205)

Yosuke Hasegawa discovered that the same-origin check in Thunderbird could
be bypassed by utilizing the importScripts Web Worker method. If a user
were tricked into viewing malicious content, an attacker could exploit this
to read data from other domains. (CVE-2010-1213)

Chris Evans discovered that Thunderbird did not properly process improper
CSS selectors. If a user were tricked into viewing malicious content, an
attacker could exploit this to read data from other domains.
(CVE-2010-0654)

Soroush Dalili discovered that Thunderbird did not properly handle script
error output. An attacker could use this to access URL parameters from
other domains. (CVE-2010-2754)